implemented step 04 by Gemini,

- added AJAX actions initSession, createProject, listProjects and getProjectStatus

public/ajax.php

@@ -51,11 +51,33 @@ try {
 	}
 
 	// Router
+	$projectActions = new \App\Actions\ProjectActions();
+
 	switch ($action) {
 		case 'ping':
 			sendResponse(true, ['message' => 'pong', 'timestamp' => time()]);
 			break;
 
+		case 'initSession':
+			sendResponse(true, $projectActions->initSession());
+			break;
+
+		case 'createProject':
+			sendResponse(true, $projectActions->createProject($userId));
+			break;
+
+		case 'listProjects':
+			sendResponse(true, $projectActions->listProjects($userId));
+			break;
+
+		case 'getProjectStatus':
+			$projectId = $data['project_id'] ?? null;
+			if (!$projectId) {
+				sendResponse(false, ['code' => 'MISSING_PROJECT_ID', 'message' => 'Project ID is required.'], 400);
+			}
+			sendResponse(true, $projectActions->getProjectStatus($userId, $projectId));
+			break;
+
 		default:
 			sendResponse(false, ['code' => 'UNKNOWN_ACTION', 'message' => "Action '$action' is not defined."], 404);
 			break;